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seen by the sketch below, but in order to exclude this deck
from calculation of nett tonnage when no cargo is carried
hi it, it has a tonnage well usually placed aft with an opening
in the deck and in the tonnage well bulkheads known as
tonnage openings. These openings must be in conformity
with the Ministry of Transport requirements. These
steamers are used for measurement cargoes and mixed
cargoes, allowing plenty of under deck space in which goods
may be sorted, divided, and kept separate.

Further decks or "islands" are usually incorporated in
shelter deck steamers, these  deck  spaces  being called

poop, bridge, forecastle, and 'tween decks, giving a
further increase of under deck space. The flush deck type
is really a single or 'tween deck ship with the poop, bridge
and forecastle combined in a continuous superstructure-
Coastal steamers are single deck, and usually single hold
steamers with the engines built aft, providing the largest
possible hatch openings in the smallest available space.
These vessels are only used for coastal trades, and near
continental ports.

It is to be noted that the type of ship to be adopted is
determined by the followingó

1.  The trade in which a vessel is to be engaged,

2.  The question of draught, together with tonnage, so
that at times the deepest draught can be obtained, and at
other times, when draught is UBimportant, there is a
maximum cargo capacity.